Complete Java SE 8 Developer Bootcamp - The Collection Interface

The video tutorial explores the collection interface and its hierarchy, focusing on the collection class and its subinterfaces for lists, sets, and queues. It explains the role of abstract classes in providing default implementations, allowing developers to override specific methods. The tutorial highlights polymorphism, enabling interchangeable use of collection classes like ArrayList and LinkedList. Key methods in the collection interface, such as add, remove, and size, are discussed, along with converting collections to arrays and vice versa.

Which of the following is NOT a sub-interface of the collection interface?

• Set

• Map

• List

• Queue

What is the main purpose of abstract classes in the context of collections?

• To provide default implementations for interface methods

• To enforce strict data types

• To define new data structures

• To increase the complexity of code

Which class provides default implementations for many of the methods in the list interface?

• ArrayList

• LinkedList

• AbstractList

• HashSet

What advantage does treating an ArrayList like a collection provide?

• It simplifies the syntax

• It reduces memory usage

• It increases the speed of operations

• It allows for easy swapping with other collection types

Which method is used to convert a collection into an array?

• convertToArray

• asList

• toArray

• arrayify